CN111692640B - Air conditioner indoor unit, air conditioner and defrosting control mode of air conditioner indoor unit - Google Patents
Air conditioner indoor unit, air conditioner and defrosting control mode of air conditioner indoor unit Download PDFInfo
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- CN111692640B CN111692640B CN201910190219.5A CN201910190219A CN111692640B CN 111692640 B CN111692640 B CN 111692640B CN 201910190219 A CN201910190219 A CN 201910190219A CN 111692640 B CN111692640 B CN 111692640B
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- 238000010257 thawing Methods 0.000 title claims abstract description 92
- 238000010438 heat treatment Methods 0.000 claims description 71
- 239000003507 refrigerant Substances 0.000 claims description 45
- 238000005485 electric heating Methods 0.000 claims description 18
- 238000004378 air conditioning Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 230000037081 physical activity Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000007667 floating Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0011—Indoor units, e.g. fan coil units characterised by air outlets
- F24F1/0014—Indoor units, e.g. fan coil units characterised by air outlets having two or more outlet openings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner indoor unit, an air conditioner and a defrosting control mode thereof, wherein the air conditioner indoor unit comprises: the air outlet at least comprises a lower air outlet; the indoor heat exchange device comprises at least two indoor heat exchangers which are connected in series up and down; the parallel pipeline assembly is connected with a heat exchanger pipeline assembly formed by at least one indoor heat exchanger positioned at the bottommost position in front of the indoor heat exchanger in parallel, and when the air conditioner is in a defrosting mode, the first valve is in an opening state. The air conditioner of the invention can continuously supply heat during defrosting, reduce the temperature of the human body activity area and improve the indoor comfort.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioner indoor unit, an air conditioner and a defrosting control mode of the air conditioner indoor unit.
Background
When the heat pump air conditioner is applied to a low-temperature high-wetland area, when the heat pump air conditioner operates in a heating mode, the outdoor heat exchanger is easy to frost, so that periodic defrosting is needed. Due to frequent operation of frosting and defrosting, heat output is discontinuous, and heating and defrosting comfortableness is poor.
The prior art discloses an air conditioner with an air outlet at the lower part and a defrosting method of the air conditioner. The air conditioner comprises an upper air outlet and a lower air outlet, wherein the upper air outlet and the lower air outlet are respectively provided with an independent air deflector, a fan and an electric heater. And determining the on/off of the electric heating and the on/off of the multi-fan according to the defrosting condition and the running state of each load before defrosting, namely when the air conditioner judges that the condition of entering defrosting is met, stopping the running of the upper fan and the upper heater thereof, and simultaneously opening the lower air outlet, the lower fan and the lower heater thereof. Because the defrosting mode adopted by the prior art is reversing defrosting, the temperature of the indoor heat exchanger can be reduced to-20 ℃ or even lower when defrosting is carried out, and heat needs to be absorbed from the environment. During defrosting, although the upper fan and the upper electric heater are closed, the refrigerant still flows through the upper heat exchanger, so that heat exchange of the upper heat exchanger and the lower heat exchanger is not uniform, and the upper heat exchanger still absorbs heat of the indoor environment, so that the temperature of the indoor environment is reduced; and when defrosting, the lower fan and the lower electric heater are turned on, because the temperature of the indoor heat exchanger is very low, the indoor heat exchanger needs to absorb a part of the radiant heat of the electric heater, on the other hand, the inlet air is blown out through the heat exchanger → the electric heater → the lower fan, and the temperature of the blown air is not high, so that a good effect of continuously supplying heat cannot be achieved.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of large temperature drop of the indoor human body activity area and poor indoor side comfort in the defrosting process of the air conditioner in the prior art, so that the air conditioner indoor unit, the air conditioner and the defrosting control mode thereof can reduce the temperature drop of the human body activity area and improve the indoor side comfort experience.
In order to solve the above technical problem, an indoor unit of an air conditioner according to the present invention includes:
the air outlet at least comprises a lower air outlet;
the indoor heat exchange device comprises at least two indoor heat exchangers which are connected in series up and down;
the parallel pipeline assembly is connected with a heat exchanger pipeline assembly formed by at least one indoor heat exchanger positioned at the bottommost position in front of the indoor heat exchanger in parallel, and when the air conditioner is in a defrosting mode, the first valve is in an opening state.
The heat exchanger tubing assembly further comprises a second valve, and the second valve is located below the lowest position of the indoor heat exchanger in the heat exchanger tubing assembly.
The air outlet also comprises an upper air outlet.
Further comprising:
and at least one fan is arranged and used for conveying the air subjected to heat exchange by the indoor heat exchanger to the corresponding air outlet.
Further comprising:
and one fan is correspondingly arranged on the air outlet side of each indoor heat exchanger and is independently controlled.
And the heating structure is at least provided with one heating structure, is arranged on the air outlet side of the indoor heat exchanger and is used for heating the air outlet of the indoor heat exchanger.
And the air outlet side of each indoor heat exchanger is correspondingly provided with one heating structure, and the heating structures are independently controlled.
Heating structure includes many parallel arrangement's electric heating member, adjacent two the interval of electric heating member is not equal, and down along last, adjacent two the interval of electric heating member is littleer.
The indoor heat exchangers are two and sequentially comprise a first indoor heat exchanger and a second indoor heat exchanger from top to bottom, and the parallel pipeline assemblies are connected with the first indoor heat exchangers in parallel.
The heat exchanger pipeline assembly comprises a first indoor heat exchanger, a second indoor heat exchanger and a heat exchanger pipeline, and further comprises a second valve, wherein the second valve and the first indoor heat exchanger form the heat exchanger pipeline assembly, and the second valve is located between the first indoor heat exchanger and the second indoor heat exchanger.
The indoor heat exchangers are three and sequentially comprise a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger from top to bottom, and the parallel pipeline assembly is connected in parallel with the heat exchanger pipeline assembly formed by the first indoor heat exchanger and the second indoor heat exchanger.
The heat exchanger pipeline assembly comprises a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger, and is characterized by further comprising a second valve, wherein the second valve, the first indoor heat exchanger and the second indoor heat exchanger form the heat exchanger pipeline assembly, and the second valve is located between the second indoor heat exchanger and the third indoor heat exchanger.
The indoor heat exchangers are three and sequentially comprise a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger from top to bottom, and the parallel pipeline assembly is connected with the first indoor heat exchanger in parallel.
The heat exchanger pipeline assembly comprises a first indoor heat exchanger, a second indoor heat exchanger and a heat exchanger pipeline, and further comprises a second valve, wherein the second valve and the first indoor heat exchanger form the heat exchanger pipeline assembly, and the second valve is located between the first indoor heat exchanger and the second indoor heat exchanger.
The air conditioner is provided with the air conditioner indoor unit.
The compressor, the outdoor heat exchanger, the throttling structure and the indoor unit of the air conditioner are sequentially connected in series to form a loop.
The outdoor heat exchanger is connected with the indoor unit of the air conditioner through the four-way valve, the first interface and the second interface of the four-way valve are respectively connected with the outdoor heat exchanger and the indoor unit of the air conditioner, and the third interface and the fourth interface are respectively connected with the inlet and the outlet of the compressor.
The throttling structure is an expansion valve.
The invention relates to a defrosting control mode for an air conditioner, which comprises the following steps:
and when the defrosting mode is executed, the refrigerant quantity of at least one indoor heat exchanger below the uppermost indoor heat exchanger in the air-conditioning indoor unit is increased.
The method for increasing the refrigerant quantity of at least one indoor heat exchanger below the uppermost indoor heat exchanger in the air-conditioning indoor unit comprises the following steps: and the refrigerant synchronously flows through the two indoor heat exchangers simultaneously.
The real-time temperature T of each indoor heat exchanger is compared with a preset temperature value T corresponding to the indoor heat exchanger, and if T is larger than or equal to T, the heating structure corresponding to the indoor heat exchanger is controlled to be closed; and if T is less than T, controlling the heating structure corresponding to the indoor heat exchanger to be opened.
The method for increasing the refrigerant quantity of at least one indoor heat exchanger below the uppermost indoor heat exchanger in the air-conditioning indoor unit comprises the following steps: and controlling at least one indoor heat exchanger positioned in front of the bottommost indoor heat exchanger to have no refrigerant passing through.
Controlling an air outlet, a heating structure and a fan which correspond to the indoor heat exchanger and are not passed by the refrigerant to be closed;
respectively comparing the real-time temperature T of each indoor heat exchanger through which the refrigerant passes with a preset temperature value T corresponding to the indoor heat exchanger, and controlling a heating structure corresponding to the indoor heat exchanger to be closed if T is more than or equal to T; and if T is less than T, controlling the heating structure corresponding to the indoor heat exchanger to be opened.
Before executing the defrosting mode, judging whether the condition of entering hot gas defrosting is met in real time, and if so, executing the defrosting mode; if not, the heating mode is continuously operated.
Judging whether the defrosting quit condition is met or not in real time, if so, quitting the defrosting mode, and executing the heating mode; if not, the defrosting mode is continuously executed.
The technical scheme of the invention has the following advantages:
1. according to the invention, the arrangement of the parallel pipeline assembly in the indoor unit of the air conditioner can enable the refrigerant to simultaneously and synchronously flow through two indoor heat exchangers by opening the first valve of the parallel pipeline assembly when the air conditioner is in a defrosting mode, so that the refrigerant throughput and the temperature of the indoor heat exchanger positioned below the two indoor heat exchangers are increased, the refrigerant heat exchange quantity of the indoor heat exchanger positioned below is increased, the temperature of air blown out from a lower air outlet is higher, on one hand, the indoor side heat supply is increased during defrosting, on the other hand, the hot air floating effect is reduced, the temperature drop close to a human body activity area is reduced, and the comfort level of a human body is improved.
2. In the invention, the second valve is arranged in the heat exchanger pipeline component of the indoor unit of the air conditioner, when the hot air is defrosted, the first valve is opened, the second valve is closed, the area of the indoor heat exchanger is reduced, on one hand, the indoor side still has heat supply, the temperature drop in the defrosted room is reduced, and the comfort level of human body is improved; on the other hand, the area of the indoor heat exchanger is reduced, more heat flows to the outdoor heat exchanger, the outdoor heat exchanger is defrosted, the defrosting time can be shortened, and the heat comfort during the whole defrosting period is improved.
3. In the invention, at least two indoor heat exchangers are arranged up and down, and the electric auxiliary heat is divided into two sections with unequal intervals and power and can be independently controlled. When the hot air defrosting is carried out, the opening/closing of the upper fan and the lower fan and the rotating speed of the upper fan and the lower fan are determined according to the trend of the refrigerant in the indoor heat exchanger and the temperature of the indoor heat exchanger, and the electric heating is selectively started. The indoor side can continuously supply heat to the indoor side while ensuring enough heat for outdoor defrosting, the floating action of hot air is weakened, the temperature drop during defrosting is reduced, and the indoor side is comfortable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a layout structure of an indoor unit of an air conditioner provided with two indoor heat exchangers according to the present invention;
fig. 2 is a refrigerant flow diagram of the air conditioner in the cooling mode of operation in embodiment 1;
fig. 3 is a refrigerant flow diagram of the air conditioner in the heating mode of the embodiment 1;
fig. 4 is a refrigerant flow diagram of the hot gas defrosting mode of the air conditioner in the embodiment 1;
fig. 5 is a refrigerant flow diagram of the air conditioner of embodiment 2 in the cooling mode;
fig. 6 is a refrigerant flow diagram of the air conditioner in the heating mode of the embodiment 2;
fig. 7 is a refrigerant flow diagram of the hot gas defrosting mode of the air conditioner in the embodiment 2;
FIG. 8 is a schematic view of the layout structure of an indoor unit of an air conditioner of the present invention, in which three indoor heat exchangers are installed;
fig. 9 is a refrigerant flow diagram of the hot gas defrost mode of the air conditioner in the embodiment 3;
fig. 10 is a refrigerant flow diagram of the hot gas defrost mode of the air conditioner in the embodiment 4;
fig. 11 is a refrigerant flow diagram of the hot gas defrost mode of the air conditioner in the embodiment 5;
FIG. 12 is a flowchart of the defrosting control of embodiment 1;
fig. 13 is a flowchart of the defrosting control of embodiment 2;
description of reference numerals:
the air conditioner comprises a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an expansion valve 4, a first valve 5, a second valve 6, a first indoor heat exchanger 7, a second indoor heat exchanger 8, a third indoor heat exchanger 9, an upper air outlet 10, a first fan 11, a first heating structure 12, a second fan 13, a second heating structure 14, a lower air outlet 15, a third fan 16 and a third heating structure 17.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1 to 4, an indoor unit of an air conditioner according to the present invention includes:
an upper outlet 10;
a lower air outlet 15;
the indoor heat exchange device comprises two indoor heat exchangers which are connected in series from top to bottom, and a first indoor heat exchanger 7 and a second indoor heat exchanger 8 are sequentially arranged from top to bottom;
and the parallel pipeline assembly is set and comprises a communication pipeline and a first valve 5 arranged on the communication pipeline, the parallel pipeline assembly is connected with the first indoor heat exchanger 7 in parallel, and when the air conditioner is in a defrosting mode, the first valve 5 is in an opening state. Preferably, the first valve 5 is a solenoid valve, which facilitates control.
As an alternative embodiment of the embodiment 1, the air conditioning indoor unit may also include only the upper outlet 10, or include three outlets, i.e., an upper outlet, a middle outlet, and a lower outlet.
As shown in fig. 1, a first fan 11 and a first heating structure 12 are arranged on the air outlet side of a first indoor heat exchanger 7 of the indoor unit of an air conditioner; and a second fan 13 and a second heating structure 14 which correspond to each other are arranged on the air outlet side of the second indoor heat exchanger 8. The first heating structure 12 and the second heating structure 14 are controlled independently. The first fan 11 and the second fan 13 are controlled independently. Therefore, when the air conditioner operates in a defrosting mode, the corresponding heating structure and the corresponding fan can be selectively started. The heat supply of the indoor side can be further improved, the temperature drop close to the human body activity area is reduced, and therefore the comfort degree of the human body is improved, and the continuity of heat supply during defrosting is guaranteed.
The heating structure is preferably an electrical heating structure. Preferably, the heating structure comprises a plurality of electric heating members which are arranged in parallel, the distance between every two adjacent electric heating members is unequal, and the distance between every two adjacent electric heating members is smaller along the upward direction. The smaller the distance between the electric heating elements below is, the higher the temperature of the air blown out from the lower air outlet 15 is, so that the temperature drop close to the human body activity area can be further reduced, and the comfort level of the human body is improved. Preferably, the electric heating element is an electric heating tube. As shown in fig. 1. In the first heating structure 12, in the vertical direction, the distance di between two adjacent electric heating tubes is different, and along the upward direction, the smaller the distance between two adjacent electric heating tubes is, and di +1 is di- Δ d; the second heating structure 12 is in the vertical direction, and the interval fi of two adjacent electric heating pipes is unequal, and down along last, and the distance of two adjacent electric heating pipes is less, has fi +1 ═ fi- Δ f. Wherein the range of di is 100-300 mm, and the range of delta d is 0-30 mm; the value range of fi is 100-300 mm, the value range of delta f is 0-30 mm, and delta f is larger than or equal to delta d.
The air conditioner has the indoor unit of the air conditioner of embodiment 1, and when the air conditioner is in normal cooling operation, the first valve 5 is closed, and the refrigerant circulates through the compressor discharge port, the outdoor heat exchanger, the expansion valve, the second indoor heat exchanger, the first indoor heat exchanger, and the compressor inlet, as shown in fig. 2. When the air conditioner is normally operated for heating, the first valve 5 is closed, and the refrigerant circulates through the compressor discharge port, the first indoor heat exchanger, the second indoor heat exchanger, the expansion valve, the outdoor heat exchanger, and the compressor inlet, as shown in fig. 3. When the hot gas defrosting operation is performed, the first valve is opened, the refrigerant passes through the exhaust port of the compressor and is divided into two branches, one branch passes through the first valve 5, the other branch passes through the first indoor heat exchanger 7, and then is converged and circulated through the second indoor heat exchanger 8, the expansion valve, the outdoor heat exchanger and the inlet of the compressor, as shown in fig. 4.
When the hot air defrosting is carried out, the electromagnetic valve 1 is opened, and the inner fan is opened, so that on one hand, heat is still supplied to the indoor side during the defrosting period; on the other hand can make more high temperature refrigerant flow through the heat exchanger 2 that is close to the lower part this moment for the heat transfer volume of lower part heat exchanger promotes, and the wind temperature that the leeward mouth blew out is higher, thereby makes during the defrosting, and steam floating effect reduces, and the temperature drop that is close to human activity region reduces, thereby human comfort level promotes.
Example 2
As shown in fig. 5 to 7, in the present embodiment 2, on the basis of embodiment 1, a second valve 6 is further included, the second valve 6 and the first indoor heat exchanger 7 constitute the heat exchanger pipe assembly, and the second valve 6 is located below the first indoor heat exchanger 7. Preferably, the second valve 6 is a solenoid valve.
As shown in fig. 5 to 7, when the air conditioner is normally operated for cooling, the first valve 5 is closed, the second valve 6 is opened, and the refrigerant circulates through the compressor discharge port, the outdoor heat exchanger, the expansion valve, the second indoor heat exchanger, the second valve 6, the first indoor heat exchanger, and the compressor inlet, as shown in fig. 5. When the heating operation is normally performed, the first valve 5 is closed, the second valve 6 is opened, and the refrigerant circulates through the compressor discharge port, the first indoor heat exchanger, the second valve 6, the second indoor heat exchanger, the expansion valve, the outdoor heat exchanger, and the compressor inlet, as shown in fig. 6. When the hot gas defrosting operation is performed, the first valve 5 is opened and the second valve 6 is closed, and the refrigerant circulates through the compressor discharge port, the first valve, the second indoor heat exchanger, the expansion valve, the outdoor heat exchanger, and the compressor inlet, as shown in fig. 7.
When the hot air defrosting is carried out, the first valve 5 is opened, the second valve 6 is closed, the area of the indoor heat exchanger is reduced, on one hand, heat is still supplied to the indoor side, the temperature drop in the defrosting chamber is reduced, and the comfort level of a human body is improved; on the other hand, the area of the indoor heat exchanger is reduced, more heat flows to the outdoor heat exchanger, the outdoor heat exchanger is defrosted, the defrosting time can be shortened, and the heat comfort during the whole defrosting period is improved.
Example 3
As shown in fig. 8, the indoor unit of an air conditioner of the present invention includes an upper outlet 10, a lower outlet 15, and a first indoor heat exchanger 7, a second indoor heat exchanger 8, and a third indoor heat exchanger 9, which are sequentially disposed from top to bottom, wherein a first fan 11 and a first heating structure 12 are disposed on an air outlet side of the first indoor heat exchanger 7; a second fan 13 and a second heating structure 14 which correspond to each other are arranged on the air outlet side of the second indoor heat exchanger 8; and a third fan 16 and a third heating structure 17 which correspond to each other are arranged on the air outlet side of the third indoor heat exchanger 9. The first heating structure 12, the second heating structure 14, and the third heating structure 17 are controlled individually. The first fan 11, the second fan 13, and the third fan 16 are individually controlled. Therefore, when the air conditioner operates in a defrosting mode, the corresponding heating structure and the corresponding fan can be selectively started.
As shown in fig. 9, the difference between this embodiment 3 and embodiment 1 is that three indoor heat exchangers are provided, and the indoor heat exchangers sequentially include a first indoor heat exchanger 7, a second indoor heat exchanger 8, and a third indoor heat exchanger 9 from top to bottom, and the parallel pipeline assembly is connected in parallel with the heat exchanger pipeline assembly formed by the first indoor heat exchanger 7 and the second indoor heat exchanger 8.
Example 4
As shown in fig. 10, in embodiment 4, based on embodiment 3, the second valve 6 is further included, the second valve 6, the first indoor heat exchanger 7 and the second indoor heat exchanger 8 constitute the heat exchanger piping assembly, and the second valve 6 is located below the second indoor heat exchanger 8.
Example 5
As shown in fig. 11, the difference between this embodiment 5 and embodiment 1 is that three indoor heat exchangers are provided, and the indoor heat exchangers sequentially include a first indoor heat exchanger 7, a second indoor heat exchanger 8, and a third indoor heat exchanger 9 from top to bottom, and the parallel pipeline assembly is connected in parallel with the first indoor heat exchanger 7.
Example 6
The air conditioner is provided with the air conditioner indoor unit.
The compressor 1, the outdoor heat exchanger 3, the throttling structure and the indoor unit of the air conditioner are sequentially connected in series to form a loop.
The outdoor heat exchanger is characterized by further comprising a four-way valve 2, wherein the four-way valve 2 is connected between the outdoor heat exchanger 3 and an indoor unit of an air conditioner in series, a first interface and a second interface of the four-way valve 2 are respectively connected with the outdoor heat exchanger 3 and the indoor unit of the air conditioner, and a third interface and a fourth interface are respectively connected with an inlet and an outlet of the compressor 1. The four-way valve 2 can be arranged to enable the air conditioner to realize three modes, namely a cooling mode (as shown in fig. 2 or 5), a heating mode (as shown in fig. 3 or 6) and a defrosting mode (as shown in fig. 4 or 7 or 9 or 10 or 11).
The throttling structure is an expansion valve 4, preferably an electronic expansion valve 4, which is convenient to control. As an alternative, a capillary throttle structure is also possible.
The invention relates to a defrosting control mode for an air conditioner, which comprises the following steps:
and when the defrosting mode is executed, the refrigerant quantity of at least one indoor heat exchanger below the uppermost indoor heat exchanger in the air-conditioning indoor unit is increased.
As shown in fig. 12, the manner of increasing the amount of refrigerant entering at least one of the indoor heat exchangers located below the uppermost indoor heat exchanger in the air-conditioning indoor unit is as follows: and the refrigerant synchronously flows through the two indoor heat exchangers simultaneously.
The real-time temperature T of each indoor heat exchanger is compared with a preset temperature value T corresponding to the indoor heat exchanger, and if T is larger than or equal to T, the heating structure corresponding to the indoor heat exchanger is controlled to be closed; and if T is less than T, controlling the heating structure corresponding to the indoor heat exchanger to be opened.
Before executing the defrosting mode, judging whether the condition of entering hot gas defrosting is met in real time, and if so, executing the defrosting mode; if not, the heating mode is continuously operated.
Judging whether the defrosting quit condition is met or not in real time, if so, quitting the defrosting mode, and executing the heating mode; if not, the defrosting mode is continuously executed.
The following describes the defrosting control method corresponding to the air-conditioning indoor unit in embodiment 1:
in the heating operation, if it is detected that the hot gas defrosting condition is satisfied, the first valve 5 is opened. The refrigerant simultaneously flows through the first indoor heat exchanger 7 and the second indoor heat exchanger 8. The temperatures of the first indoor heat exchanger 7 and the second indoor heat exchanger 8 are further detected. For the first indoor heat exchanger 7, if the temperature T of the first indoor heat exchanger 7 is greater than or equal to T1 at this time, the upper air outlet 10 is opened, the first heating structure 12 is closed, and the first fan 11 operates at a low rotation speed V2; if the temperature of the first indoor heat exchanger 7 is lower than T1, the upper air outlet 10 is opened, the first heating structure 12 is opened, and the first fan 11 operates at a low rotation speed V1. For the second indoor heat exchanger 8, if the temperature T of the second indoor heat exchanger 8 is greater than or equal to T2 at this time, the lower air outlet 15 is opened, the second heating structure 14 is closed, and the second fan 13 operates at a low rotation speed V3; if the temperature T of the second indoor heat exchanger 8 is lower than T2, the lower air outlet 15 is opened, the second heating structure 14 is opened, and the second fan 13 is operated at the low rotation speed V4. If the condition of quitting the defrosting is detected to be met, quitting the defrosting control and executing normal heating operation; and if the condition of quitting the defrosting is detected not to be met, continuously executing defrosting control.
As an alternative embodiment, the refrigerant amount entering at least one indoor heat exchanger below the uppermost indoor heat exchanger in the air conditioner indoor unit may be increased by: and controlling at least one indoor heat exchanger positioned in front of the bottommost indoor heat exchanger to have no refrigerant passing through.
Controlling an air outlet, a heating structure and a fan which correspond to the indoor heat exchanger and are not passed by the refrigerant to be closed;
respectively comparing the real-time temperature T of each indoor heat exchanger through which the refrigerant passes with a preset temperature value T corresponding to the indoor heat exchanger, and controlling a heating structure corresponding to the indoor heat exchanger to be closed if T is more than or equal to T; and if T is less than T, controlling the heating structure corresponding to the indoor heat exchanger to be opened.
The following describes the defrosting control method corresponding to the air-conditioning indoor unit in embodiment 2: as shown in fig. 13, when it is detected that the hot gas defrosting condition is satisfied during the heating operation, the first valve 5 is opened, the second valve 6 is closed, and the refrigerant does not pass through the first indoor heat exchanger 7 at the upper portion, and the high-temperature refrigerant discharged from the outlet of the compressor directly passes through the second indoor heat exchanger 8. The upper air outlet 10 is closed, the first fan 11 is closed, the first heating structure 12 is closed, and the temperature t of the second indoor heat exchanger 8 is further detected. If the temperature T of the second indoor heat exchanger 8 is greater than or equal to T3, the lower air outlet 15 is opened, the second heating structure 14 is closed, and the second fan 13 operates at a low rotation speed V5; if the temperature T of the second indoor heat exchanger 8 is lower than T3, the lower air outlet 15 is opened, the second heating structure 14 is opened, and the second fan 13 is operated at the low rotation speed V6. If the condition of quitting the defrosting is detected to be met, quitting the defrosting control and executing normal heating operation; and if the condition of quitting the defrosting is detected not to be met, continuously executing defrosting control.
Wherein: the value ranges of T1, T2 and T3 are 45-65 ℃; the value ranges of V1, V2, V3, V4, V5 and V6 are 100-500 rpm, and V1 is not more than min { V3, V4}, and V2 is not more than min { V3, V4 }.
By adopting the defrosting control mode and the air conditioner thereof, continuous heat supply during defrosting can be realized, the temperature drop of the human body activity area is greatly reduced, and the indoor side comfort experience is improved. Compared with the traditional defrosting control method, by adopting the defrosting control method and the air conditioner thereof, the average indoor temperature drop during defrosting can be reduced by 35%, and the average temperature drop in a human body activity area (the section interval of 0.1-1.6 m) can be reduced by 33%.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (21)
1. An indoor unit of an air conditioner, comprising:
the air outlet at least comprises a lower air outlet (15);
the indoor heat exchange device comprises at least two first indoor heat exchangers (7) and second indoor heat exchangers (8) which are connected in series up and down;
the parallel pipeline assembly is at least provided with one set and comprises a communication pipeline and a first valve (5) arranged on the communication pipeline, the parallel pipeline assembly is connected in parallel with a heat exchanger pipeline assembly formed by at least one indoor heat exchanger positioned in front of the bottommost indoor heat exchanger, and when the air conditioner is in a defrosting mode, the first valve (5) is in an open state, wherein the first valve (5) is an electromagnetic valve;
when the hot gas defrosting operation is carried out, the first valve (5) is opened, the refrigerant passes through the exhaust port of the compressor and is divided into two branches, one branch passes through the first valve (5), the other branch passes through the first indoor heat exchanger (7), and then the two branches are converged and circulated through the second indoor heat exchanger (8), the expansion valve, the outdoor heat exchanger and the inlet of the compressor.
2. An indoor unit of an air conditioner according to claim 1, wherein the heat exchanger tube assembly further includes a second valve (6), and the second valve (6) is located below the indoor heat exchanger located lowest in the heat exchanger tube assembly.
3. An indoor unit of an air conditioner according to claim 1, wherein the outlet further includes an upper outlet (10).
4. An indoor unit of an air conditioner according to claim 1, further comprising:
and at least one fan is arranged and used for conveying the air subjected to heat exchange by the indoor heat exchanger to the corresponding air outlet.
5. An indoor unit of an air conditioner according to claim 4, further comprising:
and one fan is correspondingly arranged on the air outlet side of each indoor heat exchanger and is independently controlled.
6. An indoor unit of an air conditioner according to claim 1,
and the heating structure is at least provided with one heating structure, is arranged on the air outlet side of the indoor heat exchanger and is used for heating the air outlet of the indoor heat exchanger.
7. An indoor unit of an air conditioner as claimed in claim 6, wherein the heating structure is provided at an air outlet side of each indoor heat exchanger, and the heating structure is controlled independently.
8. An indoor unit of an air conditioner according to claim 6,
heating structure includes many parallel arrangement's electric heating member, adjacent two the interval of electric heating member is not equal, and down along last, adjacent two the interval of electric heating member is littleer.
9. An indoor unit of an air conditioner according to any one of claims 1 to 8,
the indoor heat exchangers are two and sequentially comprise a first indoor heat exchanger (7) and a second indoor heat exchanger (8) from top to bottom, and the parallel pipeline assemblies are connected with the first indoor heat exchanger (7) in parallel.
10. Indoor unit of air conditioner according to any of claims 1 to 8, characterized in that there are three indoor heat exchangers, which comprise a first indoor heat exchanger (7), a second indoor heat exchanger (8) and a third indoor heat exchanger (9) in sequence from top to bottom, and the parallel pipe assembly is connected in parallel with the heat exchanger pipe assembly formed by the first indoor heat exchanger (7) and the second indoor heat exchanger (8).
11. Indoor unit of air conditioner according to any of claims 1 to 8, characterized in that there are three indoor heat exchangers, comprising, from top to bottom, a first indoor heat exchanger (7), a second indoor heat exchanger (8), a third indoor heat exchanger (9), the parallel pipe assembly being connected in parallel with the first indoor heat exchanger (7).
12. An air conditioner characterized by having an indoor unit of an air conditioner as set forth in any one of claims 1 to 11.
13. The air conditioner according to claim 12, wherein the compressor (1), the outdoor heat exchanger (3), the throttling structure and the indoor unit of the air conditioner are connected in series in sequence to form a loop.
14. The air conditioner according to claim 13,
the outdoor heat exchanger is characterized by further comprising a four-way valve (2), the four-way valve (2) is connected in series between the outdoor heat exchanger (3) and the indoor unit of the air conditioner, a first interface and a second interface of the four-way valve (2) are respectively connected with the outdoor heat exchanger (3) and the indoor unit of the air conditioner, and a third interface and a fourth interface are respectively connected with an inlet and an outlet of the compressor (1).
15. Air conditioner according to claim 13, characterized in that the throttling structure is an expansion valve (4).
16. A defrosting control method for an air conditioner, applied to the indoor unit of the air conditioner of any one of claims 1 to 11, comprising:
and when the defrosting mode is executed, the refrigerant quantity of the indoor heat exchanger positioned at the bottommost part in the air-conditioning indoor unit is increased.
17. The defrosting control mode according to claim 16, further comprising comparing the real-time temperature T of each indoor heat exchanger with a preset temperature value T corresponding to the indoor heat exchanger, and controlling the heating structure corresponding to the indoor heat exchanger to be turned off if T is greater than or equal to T; and if T is less than T, controlling the heating structure corresponding to the indoor heat exchanger to be opened.
18. The defrost control mode of claim 16, wherein the refrigerant quantity entering the bottommost indoor heat exchanger in the air conditioner indoor unit is increased by: and controlling at least one indoor heat exchanger positioned in front of the bottommost indoor heat exchanger to have no refrigerant passing through.
19. The defrost control of claim 18 further comprising:
controlling an air outlet, a heating structure and a fan which correspond to the indoor heat exchanger and are not passed by the refrigerant to be closed;
respectively comparing the real-time temperature T of each indoor heat exchanger through which the refrigerant passes with a preset temperature value T corresponding to the indoor heat exchanger, and controlling a heating structure corresponding to the indoor heat exchanger to be closed if T is more than or equal to T; and if T is less than T, controlling the heating structure corresponding to the indoor heat exchanger to be opened.
20. Defrost control as in any of claims 16-19,
before executing the defrosting mode, judging whether the condition of entering hot gas defrosting is met in real time, and if so, executing the defrosting mode; if not, the heating mode is continuously operated.
21. Defrost control as in any of claims 16-19,
judging whether the defrosting quit condition is met or not in real time, if so, quitting the defrosting mode, and executing the heating mode; if not, the defrosting mode is continuously executed.
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| CN113375290B (en) * | 2021-06-21 | 2022-09-02 | 海信（广东）空调有限公司 | Air conditioner and control method thereof |
| CN113864875B (en) * | 2021-10-08 | 2022-09-13 | 珠海格力电器股份有限公司 | Air conditioner and air conditioner control method |
| CN113864925B (en) * | 2021-10-19 | 2023-03-24 | 广东积微科技有限公司 | Air conditioner |
| CN114110929A (en) * | 2021-11-12 | 2022-03-01 | 珠海格力电器股份有限公司 | Defrosting control method of air conditioner and air conditioner using same |
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| CN103411269A (en) * | 2013-07-30 | 2013-11-27 | 广东美的制冷设备有限公司 | Air conditioner, indoor unit thereof and method for controlling air conditioner |
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